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ASK THE MASTER GARDENER

Bottle gentians are a long-lived perennial that bloom in August to September and are a lovely addition for late season color.
Unfortunately, once you see powdery mildew, it’s too late to treat it.
In combatting septoria leaf spot, it's very important to keep tomato leaves as dry as possible.
Hostas with chartreuse, yellow, or gold coloring can be lutescent or viridescent.

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The first year you plant them you should protect them with a 4-inch layer of winter mulch after the ground has frozen. This will prevent the young plants from heaving during fluctuating winter temperatures.
Bees are like you and me — they need food and water to live.
Rose chafers feed on the foliage of many plants, but primarily feed on the blossoms of roses and peonies.
This week, the master gardener column looks at picking the right plant, protecting against damage from cutworms by using stiff paper or aluminum foil, provides a list of edible flowers and notes an ornamental tree that can be a spectacular addition with benefits year-round.
Begin picking rhubarb stalks as soon as they have reached their full length. Each variety is different and can vary from about 1 to 2 feet in length. Hold the stalk firmly, pull and twist. Immediately after harvesting, use a knife to cut off the leaves from the stalk.
Taller grass shades out weed seeds and helps shelter the crowns from heat and wind, protecting them from excessive drying. There is evidence that roots grow deeper when grass is taller.

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Clematis is Minnesota’s showiest vine with flowers that range in size from 1-5 inches and comes in colors from pale whites and yellows to vivid red and deep purples.
While red is by far a hummingbird's favorite color, they will also feed on blue, yellow, and purple flowers.
Raptors and waterfowl are most affected by Avian Flu; whereas songbirds are not widely affected.

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